Cross-hatch test.

A cross-hatch test is an industry test for adhesion. Waterlox Original Resin-Modified Tung oil finishes are penetrating oil finishes and are therefore best used on bare wood (does not refer to stain coat(s) if used). Sometimes, sanding the surface is not an option for a project. To test the adhesion properties of a combination of finishes, test on an inconspicuous area first.

Directions to test for adhesion: Scuff sand a small inconspicuous area with 320 grit sandpaper. If you will not be sanding the surface to bare wood in the actual project, clean the area with TSP (trisodium phosphate) and water and complete a clear water rinse. Apply 1 coat of Waterlox Original Sealer/Finish. Allow the finish to cure for 4 days. Scratch a “tic-tac-toe” board into the cured finish by cutting through the film with a craft knife or box cutter blade. Be careful not to cut into the wood. Place a piece of clear adhesive tape (e.g.: Scotch® tape) over the cross-hatch and press it down firmly with your finger(s). Pull one end of the tape off with a steady motion. If there is any film on the tape, other than the pattern of cuts you made into the substrate, this finish combination will not have adequate adhesion.

If the test fails, proper sanding of the surface down to bare wood, or chemical stripping of the previous finish will need to be performed before applying Waterlox Original Resin-Modified Tung oil finishes.

Cross-hatch test

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